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27 Energy and heat transfer engineering
New standards
EVS-EN 62282-3-400:2026
Gas appliances - Combined heat and power appliance of nominal heat input inferior or equal to 70 kW
Scope: This document applies to small CHP appliance serving as a heating appliance providing both electric power and useful heat with or without a supplementary heat generator providing peak load function. Covered technologies are fuel cell, Internal combustion Engine and Stirling Engine.
This standard applies to small CHP appliances of Type A, Type B22, Type B23, Type B32, Type B33, Type B52, Type B53, Type C1, Type C3, Type C4, Type C5, Type C6, Type C8 and Type C9 as classified in EN 1479 (see Annex F),
– which use one or more combustible gases of the second and third gas families at the pressures stated in EN 437,
– where the temperature of the water heat transfer fluid does not exceed 105 ºC during normal operation,
– where the maximum operating pressure in the
• heating water circuit does not exceed 0,6 MPa,
• domestic hot water circuit (if installed) is a maximum of 1,0 MPa,
– which are intended to be installed in indoor, semi-outdoor or outdoor places, and
– which are intended to produce hot water either by the instantaneous or storage principle.
NOTE 1 For applications where the maximum allowable temperature exceeds 110 ºC or where volume multiplied by maximum allowable pressure exceeds 5,0 MPa ⋅ l, further requirements can be necessary to comply with the essential requirements of Directive 2014/68/EU (Pressure Equipment Directive (PED)).
This standard applies to small CHP appliance that are intended to be permanently connected to the electrical system of the customer (end user). Direct connection to the mains (parallel operation) is also within the scope of this standard.
NOTE 2 Parallel operation is subject to the permission of the local electric power supply utility.
This standard is limited to gas fuelled small CHP appliances that have a heat input based on lower heating value of less than or equal to 70 kW.
This document applies to appliances as shown in Figure 1, where one is an appliance where both the CHP generator and the supplementary heat generator are installed in one enclosure without any partition.
This standard does not have to apply to the supplementary heat generator of small CHP appliances where the CHP generator and the supplementary heat generator are not built in one enclosure, and whose ducts are not common (that is, each appliance has its own dedicated duct system).
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This standard applies to systems with either condensing or non-condensing conditions in the exhaust gas.
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This document specifies the requirements and test methods for the construction, safety, installation, fitness for purpose, rational use of energy, performance measurement, sound power measurement and together with requirements for the marking, and advice on the end of life disposal of a small CHP appliances.
This document does not cover all the requirements for small CHP appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex AA).
This standard applies to small CHP appliances of Type A, Type B22, Type B23, Type B32, Type B33, Type B52, Type B53, Type C1, Type C3, Type C4, Type C5, Type C6, Type C8 and Type C9 as classified in EN 1479 (see Annex F),
– which use one or more combustible gases of the second and third gas families at the pressures stated in EN 437,
– where the temperature of the water heat transfer fluid does not exceed 105 ºC during normal operation,
– where the maximum operating pressure in the
• heating water circuit does not exceed 0,6 MPa,
• domestic hot water circuit (if installed) is a maximum of 1,0 MPa,
– which are intended to be installed in indoor, semi-outdoor or outdoor places, and
– which are intended to produce hot water either by the instantaneous or storage principle.
NOTE 1 For applications where the maximum allowable temperature exceeds 110 ºC or where volume multiplied by maximum allowable pressure exceeds 5,0 MPa ⋅ l, further requirements can be necessary to comply with the essential requirements of Directive 2014/68/EU (Pressure Equipment Directive (PED)).
This standard applies to small CHP appliance that are intended to be permanently connected to the electrical system of the customer (end user). Direct connection to the mains (parallel operation) is also within the scope of this standard.
NOTE 2 Parallel operation is subject to the permission of the local electric power supply utility.
This standard is limited to gas fuelled small CHP appliances that have a heat input based on lower heating value of less than or equal to 70 kW.
This document applies to appliances as shown in Figure 1, where one is an appliance where both the CHP generator and the supplementary heat generator are installed in one enclosure without any partition.
This standard does not have to apply to the supplementary heat generator of small CHP appliances where the CHP generator and the supplementary heat generator are not built in one enclosure, and whose ducts are not common (that is, each appliance has its own dedicated duct system).
-
This standard applies to systems with either condensing or non-condensing conditions in the exhaust gas.
-
This document specifies the requirements and test methods for the construction, safety, installation, fitness for purpose, rational use of energy, performance measurement, sound power measurement and together with requirements for the marking, and advice on the end of life disposal of a small CHP appliances.
This document does not cover all the requirements for small CHP appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex AA).
Base documents: EN 62282-3-400:2026; IEC 62282-3-400:2016
EVS-EN IEC 63552:2026
Switching device for islanding (SDFI)
Scope: This document applies to switching device for islanding, hereafter referred to as SDFI, for household and similar uses, primarily intended to be used for energy efficiency (EE) purposes with local production or local storage of energy, or with both.
SDFI are intended to be installed in low voltage prosumer electrical installations (PEI) able to operate in island mode as defined in IEC 60364-8-82, so called islandable PEI.
SDFI are used to disconnect the PEI from the grid to allow operating the PEI in island mode and further reconnect the PEI to the grid.
They are intended to be used in islandable PEI which operate:
– in connected mode (direct feeding mode or reverse feeding mode), and
– in island mode,
as defined in IEC 60364-8-82.
NOTE 1 See definitions 3.10 and 3.13 of island mode and for connected mode respectively.
NOTE 2 Switching of a PEI to island mode can be subject to local regulations (grid codes) or to specific agreement with system operators. Reverse feeding is also usually subject to local regulations (grid codes).
SDFI are part of the electrical installation.
This document applies to SDFI for operation in AC single or multiphase main circuits with rated voltages not exceeding 440 V AC, frequencies of 50 Hz, 60 Hz or 50/60 Hz. They are intended to be used in installations with prospective short circuit currents not exceeding 25 000 A.
NOTE 3 DC operations are not covered by this edition and are kept under consideration for a future revision of this
document.
The SDFI is composed at least of one switching unit (SU) and a control unit (CU) to monitor its switching operations from grid connected to island mode and reverse wise.
The SDFI can be provided with a communication interface for exchange with external systems such as the Customer Energy Manager (CEM) defined in IEC 63402 series.
According to the intended use, the SDFI can be interlocked with a system referencing conductor switching device (SRCSD) according to IEC 63445 or it can be integrated with a SRCSD in a single unit.
NOTE 4 According to its intended use, the SDFI can also be used as an interface switch with the interface protection
(integrated or not). See 3.19 and 3.20.
SDFI are intended for use in circuits where protection against electrical shock and overcurrent is provided according to installation rules for low voltage electrical installations, unless the SDFI already contains such protective function. SDFI are not requested to provide isolation function and overcurrent protection according to IEC 60364-8-82. However, the isolation function can be provided by a SDFI fulfilling the requirements of the relevant product standards.
SDFI are installed by instructed persons (IEC 60050-195:2021, 195-04-02) or skilled persons (IEC 60050-195:2021, 195-04-01). They are intended to be used by ordinary persons (IEC 60005-195:2021, 195-04-03) and do not require maintenance.
It is important to note that the main overcurrent protective device of installations cannot be used as a SDFI in single dwellings or similar islandable PEI (see Clause D.5 of IEC 60364-8-82:2022)
SDFI are intended to be installed in low voltage prosumer electrical installations (PEI) able to operate in island mode as defined in IEC 60364-8-82, so called islandable PEI.
SDFI are used to disconnect the PEI from the grid to allow operating the PEI in island mode and further reconnect the PEI to the grid.
They are intended to be used in islandable PEI which operate:
– in connected mode (direct feeding mode or reverse feeding mode), and
– in island mode,
as defined in IEC 60364-8-82.
NOTE 1 See definitions 3.10 and 3.13 of island mode and for connected mode respectively.
NOTE 2 Switching of a PEI to island mode can be subject to local regulations (grid codes) or to specific agreement with system operators. Reverse feeding is also usually subject to local regulations (grid codes).
SDFI are part of the electrical installation.
This document applies to SDFI for operation in AC single or multiphase main circuits with rated voltages not exceeding 440 V AC, frequencies of 50 Hz, 60 Hz or 50/60 Hz. They are intended to be used in installations with prospective short circuit currents not exceeding 25 000 A.
NOTE 3 DC operations are not covered by this edition and are kept under consideration for a future revision of this
document.
The SDFI is composed at least of one switching unit (SU) and a control unit (CU) to monitor its switching operations from grid connected to island mode and reverse wise.
The SDFI can be provided with a communication interface for exchange with external systems such as the Customer Energy Manager (CEM) defined in IEC 63402 series.
According to the intended use, the SDFI can be interlocked with a system referencing conductor switching device (SRCSD) according to IEC 63445 or it can be integrated with a SRCSD in a single unit.
NOTE 4 According to its intended use, the SDFI can also be used as an interface switch with the interface protection
(integrated or not). See 3.19 and 3.20.
SDFI are intended for use in circuits where protection against electrical shock and overcurrent is provided according to installation rules for low voltage electrical installations, unless the SDFI already contains such protective function. SDFI are not requested to provide isolation function and overcurrent protection according to IEC 60364-8-82. However, the isolation function can be provided by a SDFI fulfilling the requirements of the relevant product standards.
SDFI are installed by instructed persons (IEC 60050-195:2021, 195-04-02) or skilled persons (IEC 60050-195:2021, 195-04-01). They are intended to be used by ordinary persons (IEC 60005-195:2021, 195-04-03) and do not require maintenance.
It is important to note that the main overcurrent protective device of installations cannot be used as a SDFI in single dwellings or similar islandable PEI (see Clause D.5 of IEC 60364-8-82:2022)
Base documents: IEC 63552:2026; EN IEC 63552:2026
EVS-EN ISO 7097-2:2026
Nuclear fuel technology - Determination of uranium in solutions, uranium hexafluoride and solids - Part 2: Iron(II) reduction/cerium(IV) oxidation titrimetric method (ISO 7097-2:2022)
Scope: This document describes an analytical method for the determination of uranium in samples from pure product materials such as U metal, UO2, UO3, U3O8, uranyl nitrate hexahydrate and uranium hexafluoride from the nuclear fuel cycle. This procedure is sufficiently accurate and precise to be used for nuclear materials accountability. This method can be used directly for the analysis of most uranium and uranium oxide nuclear reactor fuels, either irradiated or un-irradiated, and of uranium nitrate product solutions. Fission products equivalent to up to 10 % burn-up of heavy atoms do not interfere, and other elements which could cause interference are not normally present in sufficient quantity to affect the result significantly. The method recommends that an aliquot of sample is weighed and that a mass titration is used, in order to obtain improved precision and accuracy. This does not preclude the use of alternative techniques which could give equivalent performance. The use of automatic device(s) in the performance of some critical steps of the method has some advantages, mainly in the case of routine analysis.
Base documents: ISO 7097-2:2022; EN ISO 7097-2:2026
EVS-EN ISO 7097-1:2026
Nuclear fuel technology - Determination of uranium in solutions, uranium hexafluoride and solids - Part 1: Iron(II) reduction/potassium dichromate oxidation titrimetric method (ISO 7097-1:2025)
Scope: This document describes an analytical method for the determination of uranium in samples from pure product materials such as U metal, UO2, UO3, uranyl nitrate hexahydrate, uranium hexafluoride and U3O8 from the nuclear fuel cycle. This procedure is sufficiently accurate and precise to be used for nuclear materials accountability. This method can be used directly for the analysis of most uranium and uranium oxide nuclear reactor fuels, either irradiated or un-irradiated, and of uranium nitrate product solutions. Fission products equivalent to up to 10 % burn-up of heavy atoms do not interfere, and other elements which could cause interference are not normally present in sufficient quantity to affect the result significantly. The method recommends that an aliquot of sample is weighed and that a mass titration is used, in order to obtain improved precision and accuracy. This does not preclude the use of alternative techniques which could give equivalent performance. The use of automatic device(s) in the performance of some critical steps of the method has some advantages, mainly in the case of routine analysis.
Base documents: ISO 7097-1:2025; EN ISO 7097-1:2026
EVS-EN ISO 13465:2026
Nuclear energy - Nuclear fuel technology - Determination of neptunium in nitric acid solutions by spectrophotometry (ISO 13465:2024)
Scope: This document specifies an analytical method for determining the neptunium concentration by spectrophotometry, with spectrophotometer implemented in hot cell or glove box allowing the analysis of high activity solutions, with a standard uncertainty, with coverage factor k = 1 of about 5 %, in nitric acid solutions after the dissolution of nuclear reactor irradiated fuels, at different steps of the process in a nuclear fuel reprocessing plant or in other nuclear facilities. The method is applicable to sample from the process containing a concentration of neptunium between 10 mg·l-1 and 400 mg·l-1 and uranium concentrations of up to 300 g·l-1.
Base documents: ISO 13465:2024; EN ISO 13465:2026
EVS-EN ISO 6863:2026
Nuclear fuel technology - Preparation of spikes for isotope dilution mass spectrometry (IDMS) (ISO 6863:2024)
Scope: This document specifies a method which applies to the preparation and validation of the standard materials generally called “large size spikes” with an uncertainty suitable for international nuclear safeguards used for measuring the content of plutonium and/or uranium by isotope dilution mass spectrometry.
This measurement methodology can be applied to input solutions of irradiated Magnox and light water reactor fuels (boiling water reactor or pressurized water reactor); in final products at spent-fuel reprocessing plants; in feed and products of mixed oxide of plutonium and uranium (MOX); and in uranium fuel fabrication
This measurement methodology can be applied to input solutions of irradiated Magnox and light water reactor fuels (boiling water reactor or pressurized water reactor); in final products at spent-fuel reprocessing plants; in feed and products of mixed oxide of plutonium and uranium (MOX); and in uranium fuel fabrication
Base documents: ISO 6863:2024; EN ISO 6863:2026
IEC TR 63631-1:2026
Decentralized Multiple Energy Systems - Part 1: General
Scope: IEC TR 63631-1:2026 presents general features, typical cases, and key technologies related to DMES. It analyses the existing standards and identifies the gaps and needs for DMES development from the perspectives of the equipment layer, the communication layer, the information layer, the management system layer, and the application layer. This document also provides information on future standardization needs in the area.
Base documents:
IEC TS 63092-3:2026
Photovoltaics in buildings - Part 3: Determination methodology for the solar heat gain coefficient of building-integrated photovoltaic modules
Scope: IEC TS 63092-3:2026 is intended to provide a versatile method to determine the solar heat gain coefficient (SHGC or g value) of BIPV modules with a variety of designs.
It addresses the calorimetric determination of the g value for BIPV modules by using the hot box method or the cooled plate method in accordance with ISO 19467 and ISO 19467‑2. The method takes into account the effect on the g value of extracting photovoltaically generated electricity from the BIPV module in the maximum power point state.
This document applies to BIPV modules as defined in IEC 63092‑1 and specifically to BIPV modules with different effective cell area ratios but consisting of identical components such as cells, interconnects, encapsulation and front/back sheets. This evaluation method is applicable to all PV cell technologies and includes coloured BIPV modules.
It is published as a double logo Technical Specification with ISO technical committee 160: Glass in building.
It addresses the calorimetric determination of the g value for BIPV modules by using the hot box method or the cooled plate method in accordance with ISO 19467 and ISO 19467‑2. The method takes into account the effect on the g value of extracting photovoltaically generated electricity from the BIPV module in the maximum power point state.
This document applies to BIPV modules as defined in IEC 63092‑1 and specifically to BIPV modules with different effective cell area ratios but consisting of identical components such as cells, interconnects, encapsulation and front/back sheets. This evaluation method is applicable to all PV cell technologies and includes coloured BIPV modules.
It is published as a double logo Technical Specification with ISO technical committee 160: Glass in building.
Base documents:
IEC 63402-2-2:2026
Energy efficiency - Customer energy management system - Part 2-2: Data model and messaging - Interface between the customer energy manager and resource managers
Scope: IEC 63402-2-2:2026 specifies the fundamental aspects of semantic interoperability for the S2 interface and the related data exchange between a CEM and the resource managers within the premises. It provides a technology independent set of data models and interaction patterns in order to enable applications for energy management within the premises. This document does not include:
– mappings to concrete data representations (XML, JSON and similar);
– mappings to application protocols for the message passing;
– security related aspects.
This group EE publication is primarily intended to be used as an EE standard for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products which are included in the boundary mentioned in the scope of this document
– mappings to concrete data representations (XML, JSON and similar);
– mappings to application protocols for the message passing;
– security related aspects.
This group EE publication is primarily intended to be used as an EE standard for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products which are included in the boundary mentioned in the scope of this document
Base documents:
IEC 63387-1:2026
Hybrid CPV/PV modules: General characteristics and measurement procedures - Part 1: Performance measurements and power rating - Irradiance and temperature
Scope: IEC 63387-1:2026 specifies the methods for evaluating CPV/PV hybrid module performance in terms of power rating. Standard conditions for assessing the power produced by the module and the procedures to measure the power as a function of AOI, irradiance, and temperature are described. A methodology for determining a set of characterization parameter values for the hybrid CPV/PV module (FoV) is also included. In order to compare the performance of different hybrid CPV/PV modules whose output is discontinuous and time-dependent, the concept of effective nominal power is introduced.
This document is applicable to CPV/PV hybrid modules which include both solar cells designed to collect concentrated light (CPV cells array) and solar cells designed to collect diffuse or global light (PV cells array), the latter with bifacial or monofacial illumination. This document applies to hybrid CPV/PV modules with a geometrical concentration ratio > 3x for the CPV cells. For lower geometrical concentration ratio (≤ 3x), the IEC 60904-1 [11] and IEC 61853 series [9] apply.
This document is applicable to CPV/PV hybrid modules which include both solar cells designed to collect concentrated light (CPV cells array) and solar cells designed to collect diffuse or global light (PV cells array), the latter with bifacial or monofacial illumination. This document applies to hybrid CPV/PV modules with a geometrical concentration ratio > 3x for the CPV cells. For lower geometrical concentration ratio (≤ 3x), the IEC 60904-1 [11] and IEC 61853 series [9] apply.
Base documents:
Replaced standards
EVS-EN 50465:2015
Gas appliances - Combined heat and power appliance of nominal heat input inferior or equal to 70 kW
Scope: This European Standard specifies the requirements and test methods for the construction, safety, fitness for purpose, rational use of energy and the marking of a micro combined heat and power appliance; (hereafter referred to as “mCHP appliance”). This European Standard applies to mCHP appliances of types B22, B23, B32, B33, B52, B53, C1, C3, C4, C5, C6, and C8 as classified in CEN/TR 1749 – that use one or more combustible gases of the three gas families at the pressures stated in EN 437, – where the temperature of the heat transfer fluid does not exceed 105 ºC during normal operation, – where the maximum operating pressure in the – heating water circuit does not exceed 6 bar, – domestic hot water circuit (if installed) is max. 10 bar, – which can give rise to condensation under certain circumstances, – which are declared by the manufacturer to be “condensing appliance”, – which are intended to be installed in a partially protected place, – which are intended to produce hot water either by the instantaneous or storage principle, – which have a maximum heat input (based on net calorific value) not exceeding 70 kW, – which are designed for sealed or open water systems. NOTE 1 For applications where the maximum allowable temperature exceeds 110 ºC or where volume multiplied by maximum allowable pressure exceeds 50 bar.litres, further requirements may be necessary to comply with the essential requirements of Directive 97/23/EC (Pressure Equipment Directive (PED)). NOTE 2 For mCHP appliances with constructions that might not be fully covered by this European Standard or by another specific standard, the risk associated with the alternative construction shall be assessed. This European Standard applies to type testing only. This European Standard does not contain the requirements necessary for appliance capable of producing electrical energy without using the thermal energy.
Base documents: EN 50465:2015
Replaced: EVS-EN 62282-3-400:2026
EVS-EN 50465:2015/A1:2019
Gas appliances - Combined heat and power appliance of nominal heat input inferior or equal to 70 kW
Scope: Amendment for EN 50465:2015
Base documents: EN 50465:2015/A1:2019
Replaced: EVS-EN 62282-3-400:2026